Association of Ureaplasma urealyticum (Biovar 2) With Nongonococcal Urethritis

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Abstract
The tiny (T)-strain mycoplasmas, designated in 1974 as Ureaplasma urealyticum, have been divided into 2 species, Ureaplasma parvum (biovar 1) and U. urealyticum (biovar 2), but association of each of these species with nongonococcal urethritis (NGU) remains unclear. The goal of this study was to determine whether U. parvum (biovar 1) or U. urealyticum (biovar 2) is associated with NGU. The prevalences of U. parvum (biovar 1) and U. urealyticum (biovar 2) in 572 patients with urethritis were compared with those in 141 men without urethritis. The prevalence of U. urealyticum (biovar 2) in men with NGU (15.8%) or with nonchlamydial NGU (18.0%) was significantly higher than that in men without urethritis (7.8%). The prevalence of U. parvum (biovar 1) in men with NGU (8.5%) or with nonchlamydial NGU (11.1%) did not differ significantly from that in men without urethritis (13.5%). Our results showed a significant association between U. urealyticum (biovar 2) and NGU. They also suggest that the presence of U. parvum (biovar 1) in the male urethra might be the result of colonization.

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